"lbbss" wrote in message
...
My lawn mower (Craftsman 6hp) starts fine and works for a bit but then
starts dying. After trying this for a few times, then I have a
harder time to start it. When I prime it and keep trying to start
it, I check the spark plug and it is not wet from fuel, so maybe there
is a fuel problem. I left it out side covered, but water might have
gotten in anyways. So I drain all the fuel and drained the
carburetor pan from fuel. There was no water in the fuel. I put
new fuel, check the spark plug too.
The only other thing that I can think of is that 3 months ago, I
did hit something hard with the blade. It was making a slightly
different engine noise for a month or so, but eventually sounded
normal I think. Any ideas what else I could try?

The gas cap vent is likely plugged. Just try loosening the cap a turn or so and
see if it solves the problem.